Edit in JSFiddle

$("div.learnmore > p.label").click(function () {
    $(this).siblings(".inner").toggle();
});

<div class="learnmore">
    <p class="label">Learn More</p>
    <div class="inner">This is the explanatory text. There probably should be a lot more text here, but I'll keep it simple for the moment.</div>
</div>